Open to opportunities

Oluwaseyi Adetuyi

@oluwaseyiadetuyi

Message

Senior Frontend Engineer delivering scalable, performance-first React/Next.js systems with leadership.

Nigeria

Message

What I'm looking for

I’m looking for a role where I can lead engineering delivery and mentorship, build performance-first, security-first frontend systems, and keep improving velocity through quality practices and continuous learning. I thrive in teams that ship reliably and iterate fast.

I’m a Senior Software/Frontend Engineer with 4+ years architecting and delivering scalable web applications for e-commerce, fintech, and enterprise systems. I specialize in building high-performance frontend architectures using React, Next.js, and TypeScript, with a strong emphasis on engineering excellence.

At Konga Technologies, I architected and led the complete rebuild of the e-commerce platform from legacy code to a modern React/Next.js/TypeScript stack, establishing performance-first architecture with strict bundle size management and lazy loading. I led a team of 3 frontend engineers, improved code quality and productivity by 30%, and delivered GraphQL-based data fetching that reduced unnecessary data transfer and improved page-load performance across high-traffic flows.

I’ve also built security-first applications in fintech, including a contract role at Bazara where I delivered an enterprise channel banking application integrated with Sterling Bank and designed state management for accurate financial transaction flows. I mentored junior developers through TypeScript adoption and testing standards, leveraged AI-driven development tools (Cursor AI), and improved development velocity by 40% without compromising quality.

As Chief Technology Officer at Descinder (UK-Registered Startup), I led end-to-end technical strategy and product development for a talent recruitment platform, serving 500+ monthly active users while reducing API requests by 70%. I migrated the frontend codebase from JavaScript to TypeScript, built an Agile-focused engineering culture with onboarding improvements of 70%, and delivered version 1 eight weeks ahead of schedule—backed by consistent performance optimization, security-first design, and continuous improvement.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend Engineer

Current

Konga Technologies

Nov 2025 - Present (7 months)

Architected and led the complete rebuild of Konga’s e-commerce platform into a modern React/Next.js/TypeScript stack, improving performance through strict bundle size management and lazy loading. Mentored 3 engineers and implemented GraphQL and Kubernetes/CI-CD, boosting code quality/productivity by 30% and rebuild velocity by 60%.

React Next.js TypeScript GraphQL Kubernetes CI CD Performance Optimization Lazy Loading Vite

Senior Frontend Engineer (Contract)

Bazara

May 2025 - Oct 2025 (5 months)

Architected and delivered an enterprise channel banking web application integrated with Sterling Bank, handling secure account management and financial transactions for corporate clients. Implemented security-first development practices and TypeScript-based testing standards, mentoring 2 junior developers to improve productivity by 30% while using AI tools to increase development velocity by 40%.

Next.js TypeScript Git Jest Optimistic Updates Authentication

Chief Technology Officer

Descinder

Sep 2023 - Apr 2025 (1 year 7 months)

Led technical strategy and product development for a talent recruitment platform, balancing scalability, security, and rapid iteration. Built for 500+ monthly active users, reducing API requests by 70%, migrating the frontend from JavaScript to TypeScript, and improving onboarding ramp-up time by 70% through an Agile-focused engineering culture.

React TypeScript Python Django Performance Optimization Agile Scrum Migration CI CD

Lead Frontend Developer

Harbor Inc

May 2022 - Jul 2023 (1 year 2 months)

Led frontend engineering across multiple platforms, coordinating architecture decisions and raising quality standards by mentoring 3 junior developers. Optimized performance to reduce page load times by 40%, implemented JWT authentication/authorization, and resolved 50+ customer-reported issues, reducing support tickets by 60%.

React CSS Redux JWT Performance Optimization Lazy Loading Google Analytics Microsoft Clarity

Software Engineer (Freelance)

Independent Contractor

Jan 2020 - Apr 2022 (2 years 3 months)

Delivered full-stack web applications for diverse clients, including apartment booking platforms and e-library systems for university students. Built responsive, SEO-optimized experiences from Figma designs and managed end-to-end delivery from requirements gathering through deployment and maintenance.

Next.js React MongoDB REST APIs SEO Optimization Accessibility SASS